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tracing: Make tp_printk work on syscall tracepoints 

Currently the tp_printk option has no effect on syscall tracepoint.
When adding the kernel option parameter tp_printk, then:

echo 1 > /sys/kernel/debug/tracing/events/syscalls/enable

When running any application, no trace information is printed on the
terminal.

Now added printk for syscall tracepoints.

Link: https://lkml.kernel.org/r/20220410145025.681144-1-xiehuan09@gmail.com

Signed-off-by: Jeff Xie <xiehuan09@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Jeff Xie 2022-04-10 22:50:25 +08:00 committed by Steven Rostedt (Google)
parent 2f51efc6b7
commit cb1c45fb68
1 changed files with 11 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
kernel/trace/trace_syscalls.c
View File

@ -154,7 +154,7 @@ print_syscall_enter(struct trace_iterator *iter, int flags,
goto end;
/* parameter types */
if (tr->trace_flags & TRACE_ITER_VERBOSE)
if (tr && tr->trace_flags & TRACE_ITER_VERBOSE)
trace_seq_printf(s, "%s ", entry->types[i]);
/* parameter values */
@ -296,9 +296,7 @@ static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
struct trace_event_file *trace_file;
struct syscall_trace_enter *entry;
struct syscall_metadata *sys_data;
struct ring_buffer_event *event;
struct trace_buffer *buffer;
unsigned int trace_ctx;
struct trace_event_buffer fbuffer;
unsigned long args[6];
int syscall_nr;
int size;
@ -321,20 +319,16 @@ static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args;
trace_ctx = tracing_gen_ctx();
event = trace_event_buffer_lock_reserve(&buffer, trace_file,
sys_data->enter_event->event.type, size, trace_ctx);
if (!event)
entry = trace_event_buffer_reserve(&fbuffer, trace_file, size);
if (!entry)
return;
entry = ring_buffer_event_data(event);
entry = ring_buffer_event_data(fbuffer.event);
entry->nr = syscall_nr;
syscall_get_arguments(current, regs, args);
memcpy(entry->args, args, sizeof(unsigned long) * sys_data->nb_args);
event_trigger_unlock_commit(trace_file, buffer, event, entry,
trace_ctx);
trace_event_buffer_commit(&fbuffer);
}
static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
@ -343,9 +337,7 @@ static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
struct trace_event_file *trace_file;
struct syscall_trace_exit *entry;
struct syscall_metadata *sys_data;
struct ring_buffer_event *event;
struct trace_buffer *buffer;
unsigned int trace_ctx;
struct trace_event_buffer fbuffer;
int syscall_nr;
syscall_nr = trace_get_syscall_nr(current, regs);
@ -364,20 +356,15 @@ static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
if (!sys_data)
return;
trace_ctx = tracing_gen_ctx();
event = trace_event_buffer_lock_reserve(&buffer, trace_file,
sys_data->exit_event->event.type, sizeof(*entry),
trace_ctx);
if (!event)
entry = trace_event_buffer_reserve(&fbuffer, trace_file, sizeof(*entry));
if (!entry)
return;
entry = ring_buffer_event_data(event);
entry = ring_buffer_event_data(fbuffer.event);
entry->nr = syscall_nr;
entry->ret = syscall_get_return_value(current, regs);
event_trigger_unlock_commit(trace_file, buffer, event, entry,
trace_ctx);
trace_event_buffer_commit(&fbuffer);
}
static int reg_event_syscall_enter(struct trace_event_file *file,